#include <iostream>

using namespace std;

class User{
private:
    string username;
    string password;
    string email;
public:
    User(string username,string password){
        this->username=username;
        this->password=password;
    }
    User(string username,string password,string email){
        this->username=username;
        this->password=password;
        this->email=email;}
    void show(){
    cout<<"username:"<<username<<"  "<<"password:"<<password<<"  "<<"email:"<<email<<endl;}
};
int main(){
    User user1("xiaoming","123456");
    User user2("xiaohong","23456","3106524586@qq.com");
    user1.show();
    user2.show();}
